What do the changes broadly mean in terms of U values and insulation levels?
In terms of what the changes mean to the U values vary depending upon the type of work which is being carried out. Generally they require a greater range and better standard of U values (lower) for new build houses than extension, renovation, replacement, or conversion works as shown in the 4 tables that follow. Although an elemental approach can be used to show compliance with part L for extension, alteration, replacement or conversion works, however if more design flexibility is required a Sap rating could be used.
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